This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement SAI40AX40, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI40 Standard Cylinder SI40AX40
The AirTAC Airtac SI40 Standard Cylinder SI40AX40 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 40mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the SAI40AX40, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke40 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → SAI40AX40
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI40 Standard Cylinder SI40AX40
The AirTAC SI40AX40 is a discontinued double-acting ISO 15552 profile cylinder with a 40 mm bore and 40 mm stroke. It delivers 628 N push force at 0.5 MPa through a G1/4 port. The direct replacement is the SAI40AX40, retaining identical mounting dimensions, output force, and M12x1.25 rod thread.
Because this SKU lacks the -S suffix, it cannot accept a magnetic sensor. The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure, and introduces SAIL, SAIF, and BSAI variants absent from the SI line.
Airtac SI40 Standard Cylinder SI40AX40 Technical Specifications
| Model | Airtac SI40 Standard Cylinder SI40AX40 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI40AX40 |
| Bore size | Ø40 mm |
| Stroke | 40 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI40AX40 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The SAI40AX40 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI40 Standard Cylinder SI40AX40
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×40 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI40 Standard Cylinder SI40AX40 Is Used
Short-Stroke Clamping
Ideal for securing mid-weight machined parts during milling, using the 628 N push force to hold firmly against cutting vibration.
Package Diverting
Provides rapid 40 mm actuation to push cartons off a main handling line at speeds up to 800 mm/s without stalling.
Compact Ejection
Efficiently ejects molded components from tight fixtures where a 50 mm bore would be too bulky but 32 mm lacks force.
Replacing the Airtac SI40 Standard Cylinder SI40AX40 with the SAI40AX40
To replace the SI40AX40, order the SAI40AX40. Confirm the ISO 15552 mounting interface, 40 mm stroke, G1/4 port (PT/G/NPT), and mounting accessory. Since this specific SKU has no -S magnet, it cannot support position sensing; if switches are needed, select an SAI40X40S. Size both ways: a 32 mm bore yields 402 N push at 0.5 MPa, while a 50 mm bore yields 982 N. Note that a plain cylinder drifts on air loss—the cushion only decelerates. For load holding, use an external pilot check valve or the SAIL/BSAI lock variants. The -A rod denotes SUS420J2 stainless steel, offering corrosion resistance over standard carbon steel.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI40AX40
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI40 Standard Cylinder SI40AX40 FAQ
Yes, the SI40AX40 is discontinued. The direct replacement is the SAI40AX40. It matches the ISO 15552 mounting interface, 40 mm bore, 40 mm stroke, 628 N force, and G1/4 port, fitting existing fixtures perfectly.
The bore is 40 mm with a G1/4 air port. The thrust is 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa.
Request a Quote for the SAI40AX40
Send us the quantity and destination. We confirm price, stock and lead time on the SAI40AX40 replacement — usually within 7-8 hours.